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You might find RunRepeat.com helpful if you are loooking - they have nearly 100 pairs of running trainers listed at sub 250g (which they weigh themselves).
Agree the trend is definitely to have big soles which are much less packable unfortunately, but a few options I saw from RunRepeat at a quick look:
New Balance Minimus TR £73.50
Nike Free run 50 £110
Adidas Pure Motion £41
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You might find RunRepeat.com helpful
Thanks that's handy. They have 4 models of sub-300g per pair Nike spikes, inc. the 260g Zoom Victory Waffle 5 https://runrepeat.com/nike-zoom-victory-waffle-5 I like the black and silver ones https://www.ebay.co.uk/itm/405031524017?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=aybsumfkrjk&sssrc=2047675&ssuid=0PDdBtKRSKe&widget_ver=artemis&media=COPY
Have also spotted 254g per pair Brooks Mach 19 sz 9 for £22 https://www.ebay.co.uk/itm/256484034791?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=qIIUPZyWTXq&sssrc=2047675&ssuid=0PDdBtKRSKe&widget_ver=artemis&media=COPY
Did you look at the other colours?
There might be alternatives to Merrell but I got tired of looking. For some reason it's very onerous to find out the weight of a shoe. And most currently available ultralight running shoes have 3 + inch thick soles. Flats are a thing of the past.